Abstract
The adsorption kinetics of nonanediol and nonanedicarbonic acid was investigated using the oscillating jet method. It was shown that for diffusion controlled adsorption kinetics, the dynamic surface tension minous the equilibrium surface tension is linear with t—1/2 at least for sufficiently long times. The adsorption rate of these products is not controlled by diffusion and the subsurface concentration is very nearly to the bulk concentration. Results are discussed by replacing the condition of local equilibrium between subsurface and surface by a kinetic equation of the Langmuir type. There from the adsorption and desorption rate constants are calculated. The ratio of this constants give the Langmuir adsorption constant, also obtainable for equilibrium data. The agreement between the Langmuir adsorption constant from thermodynamic and dynamic data seems reasonable.
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